'''
@Author: your name
@Date: 2019-12-06 10:38:56
@LastEditTime: 2019-12-06 16:36:59
@LastEditors: Please set LastEditors
@Description: yzy
@FilePath: \IntelligentElderlyCare\test_jm.py
'''
#!/usr/bin/env python
# encoding=‘utf-8’
from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex
from Crypto import Random


class AesEncryption(object):
    ''' AES-128算法 '''

    def __init__(self):
        '''key 必须为16位 24位 32位'''
        self.key = 'zhihuiyanglaopin'.encode('utf-8')
        self.mode = AES.MODE_CBC
        self.iv = Random.new().read(AES.block_size)

    # 加密函数，如果text不足16位就用空格补足为16位，
    # 如果大于16当时不是16的倍数，那就补足为16的倍数。
    def encrypt(self, text):
        text = text.encode('utf-8')

        cryptor = AES.new(self.key, self.mode, self.iv)
        # 这里密钥key 长度必须为16（AES-128）,
        # 24（AES-192）,或者32 （AES-256）Bytes 长度
        # 目前AES-128 足够目前使用
        length = 16
        count = len(text)
        if count < length:
            add = (length - count)
            # \0 backspace
            # text = text + ('\0' * add)
            text = text + ('\0' * add).encode('utf-8')
        elif count > length:
            add = (length - (count % length))
            # text = text + ('\0' * add)
            text = text + ('\0' * add).encode('utf-8')
        self.ciphertext = cryptor.encrypt(text)
        # 因为AES加密时候得到的字符串不一定是ascii字符集的，输出到终端或者保存时候可能存在问题
        # 所以这里统一把加密后的字符串转化为16进制字符串
        return b2a_hex(self.ciphertext)

    # 解密后，去掉补足的空格用strip() 去掉
    def decrypt(self, text):
        cryptor = AES.new(self.key, self.mode, self.iv)
        plain_text = cryptor.decrypt(a2b_hex(text))
        # return plain_text.rstrip('\0')
        return bytes.decode(plain_text).rstrip('\0')


if __name__ == '__main__':
    pc = AesEncryption()  # 初始化密钥
    data = input("请输入待加密数据：")
    e = pc.encrypt(data)  # 加密
    d = pc.decrypt(e)  # 解密
    print("加密:", e)
    print("解密:", d)
